A student read his right ear against his desk while Teacher talks loudly on the desk and can hear the tapping sound only through his right ear when he lifts his head away from the desk he hears nothing what is the medium of the sound waves the student heres

The student hears the wave that is transmitted by the desk

Explanation:

Mechanical waves need a material medium to be able to be transmitted, in the case of sound waves, one of the most common media is air, but it is also transmitted in other media in this case, stationery is transmitted.

The student hears the wave that is transmitted by the desk

The speed of the wave is proportional to the density of the material, so the wave that the student hears arrives much faster through the desk than through the air